package com.nowcoder.community.service;

import com.nowcoder.community.dao.LoginTicketMapper;
import com.nowcoder.community.dao.UserMapper;
import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.MailClient;

import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.*;
import java.util.concurrent.TimeUnit;

@Service
public class UserService implements CommunityConstant {
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private MailClient mailClient;
    @Autowired
    private TemplateEngine templateEngine;
    @Value("${community.path.domain}")
    private String domain;
    @Value("${server.servlet.context-path}")
    private String contextPath;
    @Autowired
    private RedisTemplate redisTemplate;
//    @Autowired
//    private LoginTicketMapper loginTicketMapper;


    public User findUserById(int id){

        //return userMapper.selectById(id);
        User user=getCache(id);
        if(user==null){
            user=initCache(id);
        }
        return user;

    }

    public Map<String,Object> register(User user){
        Map<String, Object> map = new HashMap<>();
        if(user==null){
            throw new IllegalArgumentException("参数不能为空");

        }
        if (StringUtils.isBlank(user.getUsername())) {
            map.put("usernameMsg","账号不能为空");
            return map;

        }
        if (StringUtils.isBlank(user.getPassword())) {
            map.put("passwordMsg","密码不能为空");
            return map;

        }
        if (StringUtils.isBlank(user.getEmail())) {
            map.put("emailMsg","邮箱不能为空");
            return map;

        }
        //验证账号
        User u = userMapper.selectByName(user.getUsername());
        if(u!=null){
            map.put("usernameMsg","账号已经存在");
        }
        //验证邮箱
        u = userMapper.selectByName(user.getEmail());
        if(u!=null){
            map.put("emailMsg","邮箱已经存在");
        }
        //注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0,5));
        user.setPassword(CommunityUtil.md5(user.getPassword()+user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("https://images.nowcoder.com/head/%dt.png",new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        //发送激活邮件
        Context context=new Context();
        context.setVariable("email",user.getEmail());
        //http://localhost:8087/community/activation/101/code
        String url=domain+contextPath+"/activation/"+user.getId()+"/"+user.getActivationCode();
        context.setVariable("url",url);
        String content=templateEngine.process("/mail/activation",context);
        mailClient.sendMail(user.getEmail(),"激活账号",content);

        return map;
    }
    public int activation(int userId,String code){
        User user=userMapper.selectById(userId);
        if(user.getStatus()==1){
            return ACTIVATION_REPEAT;

        }else  if(user.getActivationCode().equals(code)){
            userMapper.updateStatus(userId,1);
            clearCache(userId);
            return ACTIVATION_SUCCESS;
        }else{
            return ACTIVATION_FAILURE;
        }
    }

    public Map<String,Object> login(String username,String password,int expiredSeconds) {
        Map<String, Object> map = new HashMap<>();
        //空值处理
        if (StringUtils.isBlank(username)) {
            map.put("usernameMsg", "账号不能为空");
            return map;
        }
        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空");
            return map;
        }
        //验证账号
        User user = userMapper.selectByName(username);
        if (user == null) {
            map.put("usernameMsg", "该账号不存在！");
            return map;
        }
        //验证状态
        if (user.getStatus() == 0)
        {
            map.put("usernameMsg","该账号未激活！");
            return map;
        }
        //验证密码
        password=CommunityUtil.md5(password+user.getSalt());
        if(!user.getPassword().equals(password)){
            map.put("passwordMsg","密码不正确！");
            return map;
        }

        //生成登录凭证
        LoginTicket loginTicket=new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setExpired(new Date(System.currentTimeMillis()+expiredSeconds*1000));
       // loginTicketMapper.insertLoginTicket(loginTicket);
        String redisKey= RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(redisKey,loginTicket);

        map.put("ticket",loginTicket.getTicket());
        return map;

    }
    //退出登录
    public void logout(String ticket){
       // loginTicketMapper.updateStatus(ticket,1);
        String redisKey= RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket = (LoginTicket) redisTemplate.opsForValue().get(redisKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(redisKey,loginTicket);
    }
    //
    public LoginTicket findLoginTicket(String ticket){
        String redisKey= RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket) redisTemplate.opsForValue().get(redisKey);
    }

    public int updateHeader(int userId,String headerUrl){

        //return userMapper.updateHeader(userId,headerUrl);
        int rows =userMapper.updateHeader(userId,headerUrl);
        clearCache(userId);
        return rows;

    }
    public User findUserByName(String username){
        return userMapper.selectByName(username);
    }
    //1.优先从缓存中取值
    private User getCache(int userId){
        String redisKey=RedisKeyUtil.getUserKey(userId);
        return (User)redisTemplate.opsForValue().get(redisKey);
    }
    //2.取不到时初始化缓存数据
    private User initCache(int userId){
        User user=userMapper.selectById(userId);
        String redisKey=RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(redisKey,user,3600, TimeUnit.SECONDS);
        return user;
    }
    //3.数据变更清除缓存
    private void clearCache(int userId){
        String redisKey=RedisKeyUtil.getUserKey(userId);
        redisTemplate.delete(redisKey);
    }
    public Collection<? extends GrantedAuthority> getAuthorities(int userId) {
        User user = this.findUserById(userId);

        List<GrantedAuthority> list = new ArrayList<>();
        list.add(new GrantedAuthority() {

            @Override
            public String getAuthority() {
                switch (user.getType()) {
                    case 1:
                        return AUTHORITY_ADMIN;
                    case 2:
                        return AUTHORITY_MODERATOR;
                    default:
                        return AUTHORITY_USER;
                }
            }
        });
        return list;
    }
    // 修改密码
    public Map<String, Object> updatePassword(int userId, String oldPassword, String newPassword) {
        Map<String, Object> map = new HashMap<>();

        // 空值处理
        if (StringUtils.isBlank(oldPassword)) {
            map.put("oldPasswordMsg", "原密码不能为空!");
            return map;
        }
        if (StringUtils.isBlank(newPassword)) {
            map.put("newPasswordMsg", "新密码不能为空!");
            return map;
        }

        // 验证原始密码
        User user = userMapper.selectById(userId);
        oldPassword = CommunityUtil.md5(oldPassword + user.getSalt());
        if (!user.getPassword().equals(oldPassword)) {
            map.put("oldPasswordMsg", "原密码输入有误!");
            return map;
        }

        // 更新密码
        newPassword = CommunityUtil.md5(newPassword + user.getSalt());
        userMapper.updatePassword(userId, newPassword);

        return map;
    }
    // 重置密码
    public Map<String, Object> resetPassword(String email, String password) {
        Map<String, Object> map = new HashMap<>();

        // 空值处理
        if (StringUtils.isBlank(email)) {
            map.put("emailMsg", "邮箱不能为空!");
            return map;
        }
        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }

        // 验证邮箱
        User user = userMapper.selectByEmail(email);
        if (user == null) {
            map.put("emailMsg", "该邮箱尚未注册!");
            return map;
        }

        // 重置密码
        password = CommunityUtil.md5(password + user.getSalt());
        userMapper.updatePassword(user.getId(), password);

        map.put("user", user);
        return map;
    }

}
